描述
Santoprene 123-50S200 is a hard, black thermoplastic vulcanizate (TPV) from Celanese specifically designed as a low-friction coextruded slip-coat layer for automotive weatherseal applications.
This is not a conventional soft sealing grade selected primarily for compression or gasket flexibility. Its purpose is different: Santoprene 123-50S200 is used on the surface of an elastomeric sealing profile to create a smooth, durable, low-friction contact layer.
Celanese describes the grade as a material for applications requiring excellent wear resistance, excellent weather resistance or a low-friction part surface.
The grade is particularly suited to automotive weatherseal systems where the seal repeatedly contacts painted metal, glass or another trim surface. A lower-friction surface can reduce drag, sticking, squeak and surface wear during opening and closing cycles.
Celanese also positions Santoprene 123-50S200 as an alternative to conventional spray-on slip-coat systems used on automotive weatherseals.
Instead of applying a separate coating after extrusion, the slip layer can be introduced during profile production by coextrusion. This can simplify manufacturing by integrating the low-friction surface directly into the weatherseal structure.
The material is designed to be coextruded with other olefin thermoplastic rubbers, making it especially useful in multi-layer TPV profiles.
Another important characteristic is its surface quality. Celanese describes Santoprene 123-50S200 as providing excellent surface smoothness and flexibility as a slip-coating material.
The current Celanese Materials Database lists a Shore D hardness of 50 and a density of approximately 0.950 g/cm³.
The Shore D scale is important here. Unlike many soft Santoprene grades measured on Shore A, this grade is much harder and is intentionally engineered to function as a thin wear-resistant surface layer rather than as the main soft sealing body.
Santoprene 123-50S200 is shear dependent and can be processed on conventional thermoplastic extrusion equipment.
Like other Santoprene TPV materials, its apparent melt viscosity decreases as shear rate increases. This behavior is important during coextrusion because screw speed, die geometry, layer thickness and melt pressure can strongly influence flow and surface quality.
The grade is polyolefin based, and Celanese states that it is recyclable within the manufacturing stream.
For more TPV products, visit our TPV Thermoplastic Vulcanizates Product Category →.
For the current Celanese TPV portfolio, see the Official Celanese Santoprene & Geolast Product Finder →.
Key Features of Santoprene 123-50S200
| Feature | Engineering Benefit |
|---|---|
| Low-Friction Surface | Reduces sliding resistance in weatherseal contact areas |
| Shore D 50 Hardness | Provides a firm wear surface suitable for thin slip-coat layers |
| Excellent Wear Resistance | Helps maintain surface performance during repeated movement |
| Excellent Weather Resistance | Suitable for exterior automotive weatherseal systems |
| Smooth Surface Finish | Supports clean, low-drag contact with glass, trim or painted surfaces |
| Coextrusion Grade | Designed for integration directly into multi-layer weatherseal profiles |
| Compatible with Olefin TPR/TPV Systems | Can be coextruded with other olefin thermoplastic rubbers |
| Alternative to Spray-On Slip Coat | Can eliminate or reduce a secondary coating operation |
| Shear-Dependent Flow | Suitable for conventional thermoplastic extrusion when shear is correctly controlled |
| Polyolefin Based | Supports low density and manufacturing-stream recyclability |
| Black Color | Suitable for automotive sealing profiles and exterior trim systems |
The key value of Santoprene 123-50S200 is its ability to create a durable, smooth and low-friction surface directly during coextrusion.
Typical Applications for Santoprene 123-50S200
Santoprene 123-50S200 is primarily intended for automotive and transportation weatherseal systems.
| Application Area | Typical Use |
|---|---|
| Automotive Weatherseals | Low-friction surface layer on dynamic sealing profiles |
| Window Seals | Slip layer contacting moving automotive glass |
| Door Weatherstrips | Wear-resistant contact surface on door seals |
| Glass Run Channels | Low-drag surface for repeated glass movement |
| Body Sealing Profiles | Coextruded wear layer on multi-material seals |
| Exterior Trim Seals | Smooth, weather-resistant slip surface |
| Dynamic Sealing Profiles | Surface layer for repeated sliding contact |
| Coextruded TPV Profiles | Thin hard surface layer over a softer TPV body |
The grade should be considered primarily as a functional surface layer, not as a replacement for the entire flexible body of a weatherseal.
Typical Properties of Santoprene 123-50S200
Physical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Density | 950 kg/m³ / 0.950 g/cm³ | ISO 1183 |
| Shore D Hardness, 15 s | 50 | ISO 48-4 / ISO 868 |
| Resin Identification | TPV | ISO 1043 |
| Part Marking Code | >TPV< | ISO 11469 |
| Color | Black | Manufacturer information |
| Delivery Form | Pellets | Manufacturer information |
The current Celanese datasheet for Santoprene 123-50S200 is intentionally concise. It publishes the grade’s principal physical identifiers and application function rather than a long table of tensile and thermal properties.
This is consistent with the role of the material as a specialized slip-coat layer rather than a conventional structural or sealing compound.
Surface & Functional Performance
Celanese identifies the following functional characteristics for Santoprene 123-50S200:
- Excellent wear resistance
- Excellent weather resistance
- Low coefficient of friction
- Excellent surface smoothness
- Flexibility suitable for slip-coat use
- Coextrudability with other olefin thermoplastic rubbers
These application-specific characteristics are more important for this grade than general tensile-property comparisons.
Hardness
A Shore D hardness of 50 confirms that Santoprene 123-50S200 is significantly harder than conventional soft Santoprene TPV grades.
The higher surface hardness helps produce a durable contact layer that can resist rubbing and repeated sliding.
Because the material is typically used as a relatively thin coextruded layer, the underlying softer TPV can continue to provide sealing flexibility while the outer layer provides wear and friction performance.
Why Choose Santoprene 123-50S200?
The primary reason to choose Santoprene 123-50S200 is its dedicated function as a coextruded slip-coat material.
Traditional automotive weatherseal systems often use a soft rubber or TPV profile combined with a separately applied surface coating.
That coating may be sprayed or otherwise applied after extrusion to reduce friction where the weatherseal contacts glass, painted metal or trim.
A separate coating process creates additional manufacturing steps such as coating application, drying or curing, surface inspection, adhesion control and extra handling.
Santoprene 123-50S200 is designed to move the low-friction function directly into the extrusion process.
By coextruding the slip layer together with the main weatherseal profile, manufacturers can create an integrated multi-material structure.
The outer layer provides low friction and wear resistance, while the softer main profile provides the required sealing force and flexibility.
This approach can improve process consistency and reduce dependence on a secondary surface-treatment operation.
Wear resistance is particularly important in automotive glass-run channels and weatherstrips. The contact surface may experience thousands of sliding cycles during vehicle life.
The low-friction surface of Santoprene 123-50S200 helps reduce resistance to motion and can improve the long-term feel and function of the sealing system.
Weather resistance is equally important. Automotive weatherseals are exposed to sunlight, temperature changes, moisture, ozone and environmental contamination.
Celanese specifically lists excellent weather resistance as a key feature of this grade.
Surface smoothness is another important factor. A rough or inconsistent slip layer can increase friction, noise or wear. The grade is designed to provide an excellent smooth surface when the extrusion system is properly optimized.
For customers producing automotive weatherstrip, glass-run channel or other coextruded sealing profiles, Santoprene 123-50S200 is a highly specialized material designed around exactly this surface-performance requirement.
Processing Guidelines for Santoprene 123-50S200
The current Celanese Materials Database identifies coextrusion as the primary processing method for Santoprene 123-50S200.
Published Processing Guidance
| Processing Parameter | Celanese Guidance |
|---|---|
| Primary Process | Coextrusion |
| Drying Temperature | 65°C |
| Drying Time | 4 hours |
| General Processing Window | 175–230°C |
| Screw Speed Reference | 100–200 rpm |
| Optional Back Pressure | 0.3–0.7 MPa |
| Holding Pressure | 50–75% of actual injection pressure |
Celanese recommends desiccant drying for approximately 4 hours at 65°C before processing.
The manufacturer gives a broad Santoprene TPV processing window of approximately 175–230°C.
Because Santoprene 123-50S200 is a coextrusion slip-coat grade, actual processing conditions should be optimized together with the main profile TPV grade, extruder size, screw design, layer thickness, die design, melt pressure, line speed, cooling conditions and surface appearance target.
Shear-Dependent Flow
Santoprene 123-50S200 is shear dependent.
When shear rate increases, apparent melt viscosity decreases. This behavior is useful during extrusion but also means process conditions can have a strong effect on layer uniformity.
Higher screw speed can increase shear and improve flow, but excessive shear or temperature can affect surface quality.
Processors should therefore optimize the relationship between screw speed, melt temperature, die pressure, layer thickness, line speed and cooling rate.
Coextrusion Design
The grade is specifically designed to be coextruded with other olefin thermoplastic rubbers.
In a typical weatherseal structure, the main profile provides elasticity and sealing force while Santoprene 123-50S200 forms the harder low-friction outer surface.
The slip layer should be thick enough to provide continuous coverage but thin enough to preserve the flexibility of the underlying weatherseal.
Material Compatibility
Celanese states that Santoprene TPV is incompatible with acetal (POM) and PVC.
Extrusion equipment should be properly purged before processing Santoprene 123-50S200 if POM or PVC has previously been used.
Cross-contamination can lead to processing instability or surface defects.
Selection Guidance for Santoprene 123-50S200
Santoprene 123-50S200 should be considered when the application requires a hard TPV slip surface, low friction, excellent wear resistance, exterior weather resistance, smooth surface appearance, coextrusion with olefin-based TPV/TPE, black color, a replacement for spray-on slip coatings, and conventional thermoplastic extrusion processing.
This grade is particularly well suited to customers already producing Santoprene or other olefin-based weatherseal profiles and seeking a functional outer layer with integrated low-friction performance.
The grade is not intended primarily for applications where the entire part must remain soft. Its hardness and role are optimized for the surface layer.
Related Products
Santoprene 123-40 – Black TPV in the Santoprene 123 series for weatherseal and specialty profile applications.
Santoprene 123-50W175 – Black specialty TPV for weatherseal-related applications.
Santoprene 123-52W242 – Black Shore D specialty slip-coat extrusion grade with low friction and good wear properties.
View More TPV Thermoplastic Vulcanizates →
Technical Documents for Santoprene 123-50S200
| Document Type | Description |
|---|---|
| TDS | Current Celanese grade description, hardness, density and processing information |
| SDS | Safety Data Sheet |
| Santoprene Product Finder | Celanese grade selection and application positioning |
| Extrusion Processing Guide | General Santoprene extrusion and die-design guidance |
| COA | Batch-specific quality information where available |
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FAQ About Santoprene 123-50S200
Q1: What is Santoprene 123-50S200?
Santoprene 123-50S200 is a hard black TPV from Celanese designed primarily as a low-friction coextruded slip-coat layer for automotive weatherseal applications.
Q2: What is the hardness of Santoprene 123-50S200?
The current Celanese datasheet lists Shore D 50 after a 15-second reading.
Q3: What is the density?
The current density is approximately 0.950 g/cm³.
Q4: What is the main application of Santoprene 123-50S200?
Its main application is as a coextruded low-friction surface layer on automotive weatherseals, including window seals and other dynamic sealing profiles.
Q5: Can Santoprene 123-50S200 replace a spray-on slip coat?
Celanese specifically states that the grade can be used as an alternative to spray-on slip-coat systems in automotive weatherseal applications.
Q6: Is Santoprene 123-50S200 wear resistant?
Yes. Excellent wear resistance is one of the grade’s primary manufacturer-listed features.
Q7: Is the grade suitable for outdoor weather exposure?
Yes. Celanese specifically lists excellent weather resistance as a key feature.
Q8: Can Santoprene 123-50S200 be coextruded with other TPV materials?
Yes. Celanese states that the grade is coextrudable with other olefin thermoplastic rubbers.
Q9: What drying conditions are recommended?
Current Celanese guidance recommends 4 hours at 65°C in a desiccant dryer.
Q10: What processing temperature is recommended?
Celanese gives a broad Santoprene TPV processing window of approximately 175–230°C. Actual coextrusion conditions should be optimized according to die design, layer thickness, line speed and the companion TPV grade.
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